Configuring your App with app.yaml

A .NET app in App Engine is configured using an app.yaml
file, that contains CPU, memory, network and disk resources, scaling, and other
general settings including environment variables.

About app.yaml files

Specify all the runtime configuration for your .NET app, including
versions and URLs, in the app.yaml file. This file acts as a deployment
descriptor of a specific
service
version.
You must first create the app.yaml file for the default service of your app
before you can create and deploy app.yaml files for additional services.

You can specify a unique name for your app.yaml files, but then you must
specify the file name with the deployment
command
as well. For example, if you name your app.yaml file service-name-app.yaml
or app.flexible.yaml, then you must deploy your app using either:

To learn more about structuring multiple services and app.yaml files in your
app, see Structuring Web Services.
Depending on the complexity of your app's service, you might only need to define
a few elements in the corresponding app.yaml file. The following example
demonstrates what a simple .NET app might require in the
flexible environment:

runtime: aspnetcore
env: flex
# This sample incurs costs to run on the App Engine flexible environment.
# The settings below are to reduce costs during testing and are not appropriate
# for production use. For more information, see:
# https://cloud.google.com/appengine/docs/flexible/python/configuring-your-app-with-app-yaml
manual_scaling:
instances: 1
resources:
cpu: 1
memory_gb: 0.5
disk_size_gb: 10
env_variables:
# The __ in My__Greeting will be translated to a : by ASP.NET.
My__Greeting: Hello AppEngine!